Is there anything different I need to do when draining a central heating system that has underfloor heating on one side downstairs? Also for refilling thanks
Draining down central heating system
- Thread starter tomsim
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Depends on why you're draining I guess. Can you isolate the UFH circuits, I always fit HQ full bore valves on the flow and returns to UFH manifolds.
Only issue you may have is air, minimise that by not activating the 2 port and when it comes to refilling and bleeding then pay particular attention the UFH circuits.
Only issue you may have is air, minimise that by not activating the 2 port and when it comes to refilling and bleeding then pay particular attention the UFH circuits.
I'm draining to swap a couple of rads downstairs.
The rads are piped from drops. So thought may not effect the underfloor heating circuit?
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nope, probably won't, even then the manifold should have an auto air vent at the top and/or bottom so should deal with any air should it get to it.
Thank you. It does have an auto air vent
It's an Splan system maybe Splan plus with the central heating zones.
On the drops the water should stop enough when drained down to solder?
Depends, sometimes system pipe drops like that continue to drip for ages as the pipework above keep draining, may make soldering difficult. All you can do is give it a try and worst case a fitting in the wall is pushfit/compression. Not really recommended/ideal but sometimes needs must.
Pipe rad up and use push fit or compression as last fitting on to existing?
Are iso valves really that bad? If fitted on a drop to one radiator. As the internal bore of the rad valve is tiny.
It's not that they're restrictive to flow but your bog standard ISO ball valves are not really designed for central heating, long term they can and do leak, especially if the inhibitor drops.
Good quality full bore valves tend to use more resilient materials for the O- Rings and better quality Teflon/PTFE seats.
Leak out of the slotted on/off bit?
Yup, the whole point is they're there to isolate but usually the first time they're used after being there for a while, they leak. Once they do that then they tend to keep leaking.
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